My great-great-grandfather's parents are a mystery. His mother, Susan Lagle (Abt.1840-1 Jun 1907) first appears in an 1880 census record, and the information lists her as born in North Carolina, single, head of the household, and there's a 14-year age difference between my great-great-grandfather and his sister, Mary Catherine Lagle (Feb 1869-19 Feb 1955). Beyond that, Susan's maiden name is unknown, and her husband is even more elusive. I have found a potential match, William H Lagle (Abt. 1840-1905), but I can't find any sources to confirm or deny it. I do have a personal hypothesis that Susan and her husband, based on their surname origin, could have been illegal immigrants, but that has no evidence. Ancestry can't find anything, and now I'm at a loss.